The Experts below are selected from a list of 6 Experts worldwide ranked by ideXlab platform
O J Nielsen - One of the best experts on this subject based on the ideXlab platform.
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atmospheric chemistry of short chain Haloolefins photochemical ozone creation potentials pocps global warming potentials gwps and ozone depletion potentials odps
Chemosphere, 2015Co-Authors: T J Wallington, M Sulbaek P Andersen, O J NielsenAbstract:Short-chain Haloolefins are being introduced as replacements for saturated halocarbons. The unifying chemical feature of Haloolefins is the presence of a CC double bond which causes the atmospheric lifetimes to be significantly shorter than for the analogous saturated compounds. We discuss the atmospheric lifetimes, photochemical ozone creation potentials (POCPs), global warming potentials (GWPs), and ozone depletion potentials (ODPs) of Haloolefins. The commercially relevant short-chain Haloolefins CF3CFCH2 (1234yf), trans-CF3CHCHF (1234ze(Z)), CF3CFCF2 (1216), cis-CF3CHCHCl (1233zd(Z)), and trans-CF3CHCHCl (1233zd(E)) have short atmospheric lifetimes (days to weeks), negligible POCPs, negligible GWPs, and ODPs which do not differ materially from zero. In the concentrations expected in the environment their atmospheric degradation products will have a negligible impact on ecosystems. CF3CFCH2 (1234yf), trans-CF3CHCHF (1234ze(Z)), CF3CFCF2 (1216), cis-CF3CHCHCl (1233zd(Z)), and trans-CF3CHCHCl (1233zd(E)) are environmentally acceptable.
T J Wallington - One of the best experts on this subject based on the ideXlab platform.
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atmospheric chemistry of short chain Haloolefins photochemical ozone creation potentials pocps global warming potentials gwps and ozone depletion potentials odps
Chemosphere, 2015Co-Authors: T J Wallington, M Sulbaek P Andersen, O J NielsenAbstract:Short-chain Haloolefins are being introduced as replacements for saturated halocarbons. The unifying chemical feature of Haloolefins is the presence of a CC double bond which causes the atmospheric lifetimes to be significantly shorter than for the analogous saturated compounds. We discuss the atmospheric lifetimes, photochemical ozone creation potentials (POCPs), global warming potentials (GWPs), and ozone depletion potentials (ODPs) of Haloolefins. The commercially relevant short-chain Haloolefins CF3CFCH2 (1234yf), trans-CF3CHCHF (1234ze(Z)), CF3CFCF2 (1216), cis-CF3CHCHCl (1233zd(Z)), and trans-CF3CHCHCl (1233zd(E)) have short atmospheric lifetimes (days to weeks), negligible POCPs, negligible GWPs, and ODPs which do not differ materially from zero. In the concentrations expected in the environment their atmospheric degradation products will have a negligible impact on ecosystems. CF3CFCH2 (1234yf), trans-CF3CHCHF (1234ze(Z)), CF3CFCF2 (1216), cis-CF3CHCHCl (1233zd(Z)), and trans-CF3CHCHCl (1233zd(E)) are environmentally acceptable.
M Sulbaek P Andersen - One of the best experts on this subject based on the ideXlab platform.
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atmospheric chemistry of short chain Haloolefins photochemical ozone creation potentials pocps global warming potentials gwps and ozone depletion potentials odps
Chemosphere, 2015Co-Authors: T J Wallington, M Sulbaek P Andersen, O J NielsenAbstract:Short-chain Haloolefins are being introduced as replacements for saturated halocarbons. The unifying chemical feature of Haloolefins is the presence of a CC double bond which causes the atmospheric lifetimes to be significantly shorter than for the analogous saturated compounds. We discuss the atmospheric lifetimes, photochemical ozone creation potentials (POCPs), global warming potentials (GWPs), and ozone depletion potentials (ODPs) of Haloolefins. The commercially relevant short-chain Haloolefins CF3CFCH2 (1234yf), trans-CF3CHCHF (1234ze(Z)), CF3CFCF2 (1216), cis-CF3CHCHCl (1233zd(Z)), and trans-CF3CHCHCl (1233zd(E)) have short atmospheric lifetimes (days to weeks), negligible POCPs, negligible GWPs, and ODPs which do not differ materially from zero. In the concentrations expected in the environment their atmospheric degradation products will have a negligible impact on ecosystems. CF3CFCH2 (1234yf), trans-CF3CHCHF (1234ze(Z)), CF3CFCF2 (1216), cis-CF3CHCHCl (1233zd(Z)), and trans-CF3CHCHCl (1233zd(E)) are environmentally acceptable.
Olafs Daugulis - One of the best experts on this subject based on the ideXlab platform.
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catalytic coupling of Haloolefins with anilides
ChemInform, 2005Co-Authors: Vladimir G Zaitsev, Olafs DaugulisAbstract:A strategy in which C−H activation reactions promoted by Pd(II) have been combined with β-heteroatom elimination to create a catalytic cycle achieving the arylation of haloacrylates is reported. The catalytic cycle can be subdivided into four parts: (1) C−H activation; (2) the functionalization step, migratory insertion of the olefin into a metal−carbon bond; (3) β-heteroatom elimination; and (4) exchange of metal halide (if X = halogen) for a less coordinating anion. In this catalytic cycle, the oxidation state of the metal does not change, and an oxidant is not required. The method is more functional group tolerant compared with the existing alkene−arene coupling methods based on electrophilic C−H activation.
Vladimir G Zaitsev - One of the best experts on this subject based on the ideXlab platform.
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catalytic coupling of Haloolefins with anilides
ChemInform, 2005Co-Authors: Vladimir G Zaitsev, Olafs DaugulisAbstract:A strategy in which C−H activation reactions promoted by Pd(II) have been combined with β-heteroatom elimination to create a catalytic cycle achieving the arylation of haloacrylates is reported. The catalytic cycle can be subdivided into four parts: (1) C−H activation; (2) the functionalization step, migratory insertion of the olefin into a metal−carbon bond; (3) β-heteroatom elimination; and (4) exchange of metal halide (if X = halogen) for a less coordinating anion. In this catalytic cycle, the oxidation state of the metal does not change, and an oxidant is not required. The method is more functional group tolerant compared with the existing alkene−arene coupling methods based on electrophilic C−H activation.
